KR100838227B1 - Structure of high-strength and rapidly-hardening prepacked concrete track for carrying out mechanization and working method thereof - Google Patents

Abstract

A structure of high-strength and rapidly-hardening prepacked concrete track for carrying out mechanization and working method thereof are provided to dig ballast, construct geotextile, placing a new ballast layer by using a ballast cleaner and a dry type pebble washer. A structure of high-strength and rapidly-hardening prepacked concrete track for carrying out mechanization comprises a geotextile(30), a new ballast layer(21), a concrete sleepers(50), rail clamping units(60), and rails(70). The geotextile is constructed on a road bed(10). The new ballast layer is built on the geotextile. The concrete sleepers are constructed on the new ballast layer in parallel to each other and reinforced horizontally by applying post tension to obtain necessary tensile strength. The rail clamping units are mounted on the sleepers and adjustable ±30mm vertically, ±25mm horizontally when the rails are twisted. The rails are vertically fastened to the sleepers via the rail clamping units. Panels are built at two ends of the geotextile so the lateral sides of the geotextile are independent vertically to the bottom. The new ballast layer is constructed by filling the inner space, in which the geotextile is installed, with high-strength and rapidly-hardening prepacked concrete.

Description

Structure of High-Strength and Rapidly-hardening Prepacked Concrete Track for Carrying Out Mechanization and Working Method

1A to 1C are schematic perspective, front cross-sectional and side views, respectively, showing a concrete track structure according to the present invention.

Figure 2 is a schematic perspective view of geotextiles made to be attached to the phase cleaner according to the present invention.

3 is a schematic perspective view of a sleeper according to the present invention.

4 is a schematic side view of a continuous injection equipment for injecting cement mortar to form a new bed layer.

Figure 5 is a schematic flowchart showing a process of concrete gravel road track in accordance with the present invention.

<Description of the symbols for the main parts of the drawings>

10 Roadbed 21 New urban layer 30 Geotextile

50 sleepers 60 rail fastening 70 track

The present invention relates to a structure and a construction method of a high strength pre-concrete concrete track for mechanized construction, and more particularly, replacing existing sleepers and rail fastening devices, excavating existing existing layers, laying geotextiles on the subgrade layer. After that, the existing concrete gravel dry-cleaned in the field is filled therein, and a high strength fast hard cement mortar is injected to form a high strength fast hard concrete compact layer, thereby concretely orbiting the existing gravel flat track. It relates to the structure and construction method of the track.

The track is the part that supports the weight of the vehicle in the middle of the railway tracks, transfers it to the roadbed, and induces the train to run. In particular, the driving stability and ride comfort of the train are directly affected by the track performance, and the interaction between the track and the train is the biggest factor affecting the noise and vibration.

Gravel-like tracks are the most commonly used as the basic structure of tracks that have been used conventionally because they are inexpensive in construction cost and have appropriate track elasticity. Gravel is located at the bottom of the track, absorbing shocks while driving the train, reducing vibration, and distributing the load of the train delivered via the sleepers to prevent rails from sinking or moving the sleepers. do. It also facilitates drainage of rainwater and prevents grass growth on the island.

However, due to frequent friction, the gravel is broken down into fine particles and the drainage is bad due to the inflow of soil, the gravel is easy to lose its elasticity, so it is necessary to periodically gravel or replace the gravel, which requires a lot of manpower, cost and time.

In recent years, due to the high speed, weight, and compactness of trains, the speed of advancing the tracks of gravel tracks has increased, and the maintenance and repair costs of tracks have increased, and concrete statues and slab tracks have been constructed.

The use of concrete slings greatly reduces maintenance work and provides good drainage, less vibration and sloshing of the slings. The slab slings have a structure that integrates sleepers and slings. Reduced maintenance costs by reducing sinking. Therefore, during the new construction, the concrete gravel tracks are gradually replaced from the existing gravel road tracks, and research on the vitalization tracks that can reduce maintenance and repair, which is a problem of the existing gravel road tracks, is being conducted. However, the traditional gravel road track still has a high occupancy rate, so it is effective to improve the existing road gravel tracks and make the concrete road tracks into slab tracks.

Conventional road renovation work was mainly carried out to improve the old gravel road tracks of the subway, and consisted of the old track demolition, the installation of new sleepers, the formwork, the installation of the jackie and the scaffold, the concrete placement and the curing. It has a construction process and track structure similar to construction.

Unlike the subway tracks, however, there is no invert on the gravel road tracks of existing railways, so concrete spills when placing concrete, and construction work is slowed down due to manpower demolition work. There is a problem in that long-term train operation is disturbed.

Therefore, it is necessary to develop a technology-intensive track structure capable of completing a certain work within a limited construction period so as not to interfere with the operation of the train, and to enable normal train operation immediately after the construction.

The present invention was developed in order to solve the problems of the conventional technology of vibrating gravel road, as described above, a new concrete track structure and construction method that can prevent the outflow of concrete by laying civil fibers without installing an invert The purpose is to provide.

In addition, an object of the present invention is to provide a new concrete track structure and construction method by using a phase cleaner and a dry gravel washer to perform existing phase excavation, civil fiber laying, and new phase fill.

In addition, new concrete tracks are formed to form a high strength, fast concrete preformed concrete layer by injecting a high strength, fast cement cement mortar into the new bed using a cement mortar injection equipment without the need for installing a temporary support during the phase improvement operation. To provide a structure and construction method of the object.

In order to achieve the above object, in the present invention, the geosynthetic fiber laid on the upper surface of the roadbed layer, the new bed layer formed on the geotextile, the sleeper laid on the new bed layer and the rail fastening device laid on the sleeper; And a track connected to the rail fastening device; The geosynthetic fiber is laid so that the bottom surface of the geosynthetic fiber is in contact with the upper surface of the roadbed layer, and both sides of the bottom surface of the geosynthetic fiber have side surfaces perpendicular to the bottom surface, and the new island layer has an internal space in which the geotextile is laid. Made of high-strength fast-hard concrete prefilled and cured; A plurality of sleepers are installed parallel to each other on a new bed; Provides a high-strength pre-concrete concrete track structure including a track coupled to the sleeper vertically using a rail fastening device on the sleeper upper surface.

In addition, in the present invention, the geosynthetic fiber may include a configuration in which a panel having a predetermined width is installed at both ends to stand on the upper surface of the subgrade layer.

In addition, in the present invention, the high-strength fast-acting concrete to express a compressive strength of 30MPa or more, the cement mortar constituting the pre-concrete concrete is a fast cement, Ca ^{2 +} and SO ₄ ^{2 -} additives Including; The particle size of the aggregate constituting the pre-concrete concrete is 100% of the size passing weight of 63mm, 75-95% of the size passing weight of 50mm, 50-80% of the size passing weight of 40mm, 30mm The high-strength pre-concrete track structure is characterized in that the through-body weight of 25 to 50%, the through-body weight of 25 mm is 5 to 30%, the through-body weight of 20 mm is 0 to 10%. do.

In addition, the present invention, the step of replacing the existing sleepers and rail fastening device; Coupling a track to a replaced sleeper using the replaced rail fastening device; Excavating the old top layer using a phase cleaner, laying geotextiles on the subgrade layer, and dry washing the existing phase gravel to fill a new phase gravel layer in the internal space in which the geotextiles are installed; Adjusting the position of the trajectory using MTT; And it provides a method of constructing a high-strength pre-concrete concrete track comprising the step of injecting a high-strength fast cement mortar into the new phase gravel layer to form a pre-concrete concrete layer.

In addition, in the present invention, after excavating the spherical layer using the phase cleaner, laying the ground fiber on the roadbed layer, and dry washing the existing phase gravel to fill the new phase gravel layer in the interior space in which the ground fiber is installed The steps are; Excavation work is carried out at the front end of the phase cleaner by one operation of the phase cleaner, and at the same time, geotextiles are laid at the stop of the phase cleaner, and the new phase gravel is filled at the rear of the phase cleaner. Provided are a method of constructing a high strength pre-concrete concrete track.

Hereinafter, with reference to the accompanying drawings will be described the specific configuration and effect of the structure and construction method of the concrete phase track according to the present invention.

1A to 1C are schematic perspective views, front cross-sectional views and side views showing the structure of the concrete inlet tracks according to the present invention, respectively.

As shown in the drawings, the concrete island track according to the present invention, the roadbed layer 10 from below, a geotextile 30 is laid more than one layer, a new island layer 21, sleepers 50, rail fastening device 60 ) And trajectory 70.

Figure 2 shows a geotextile 30 made to be attached to the iconic cleaner equipment in accordance with the present invention. The geosynthetic fiber 30 may be a nonwoven fabric, a geotextile, a geomembrane, or the like, which is laid on the upper surface of the subgrade layer 10, and a bottom surface thereof contacts the upper surface of the subgrade layer 10. In other words, the cross section is laid in the shape of └┘ so as to have a side surface perpendicular to the direction. In addition, as shown in the figure in the circle enlarged section along the line AA of Figure 2, when the geosynthetic fiber 30 is laid on the subgrade layer 10, both ends of the left and right sides of the geosynthetic fiber 30 perpendicular to the base In order to be fixed in the direction, both ends of the geosynthetic fiber 30 is produced by inserting a panel of a predetermined width. The panel is preferably installed on the both sides of the geosynthetic fiber 30 by a length corresponding to the height of the new conductive layer 21 using a grid-like polypropylene. In addition, the geosynthetic fiber 30 may be attached to the iconic cleaner equipment and manufactured in a roll form using a connecting beam to enable mechanized construction. The installation of the geosynthetic fiber 30 is performed simultaneously with two kinds of operations using a phase cleaner or a phase regulator, and the water flowing from rainwater or surroundings is quickly drained and prevents leakage of the injected concrete. There is no need to install it.

The new bed layer 21 is formed of a pre-concrete concrete layer by injecting new bed gravel and high strength fast cement mortar.

The new icon gravel forming the new icon layer 21 basically recycles the existing icon gravel, in order to reduce the time required to remove the existing icon gravel, take out the removed gravel, and fill the new icon gravel, Existing phase gravel recovered by the cleaner is washed on-site using a dry phase gravel washing facility and then filled in the subgrade layer 10 again. At this time, only the gravel of the appropriate particle size can be recycled and the shortage can be supplemented with new gravel.

After the new phase gravel is filled, a continuous injection device 24 consisting of a mixer 25, a mixer hood, a continuous mixer 26, a cushion tank 27, and a pump 28 is used as shown in FIG. The high-strength fast cement mortar is injected between the new gravel to form pre-concrete concrete. Since the cement mortar is injected into the space between the sleepers 50 in a natural flow method, fluidity must be good to be uniformly injected without gaps between the gravel beds, and the curing time must be short so as not to interfere with the train operation. It should be higher than general cement mortar with compressive strength of 10MPa because it receives the load of. The cement mortar of the present invention preferably expresses a compressive strength of 30 MPa or more in order to support the train load. In addition, it is preferable to select the cement mortar mix to express a uniaxial compressive strength of 0.4MPa on an hour basis so as not to interfere with train operation during construction. In addition, in order to increase the fluidity while considering the economical efficiency, it is preferable to add a mixing agent such as a fluidizing agent and fine aggregate of a certain particle size. In addition, the cement mortar includes a fast cement, the curing speed is fast, high strength is expressed by using Ca ^{2 +} and SO ₄ ^{2 -} component additives, including a fine aggregate of a certain particle size to have a high flowability It is preferable. On the other hand, the particle size of the island-based gravel, which is the aggregate constituting the pre-concrete concrete, has a size passing weight of 63 mm 100%, a size passing weight of 75 mm 75-95%, and a size passing weight of 40 mm 50- It is preferable that 80% and the size body passage weight of 30 mm are 25-50%, the size body passage weight of 25 mm is 5 to 30%, and the size body passage weight of 20 mm is 0 to 10%.

3 shows a sleeper 50 according to the invention. In order to increase the load-dispersing capacity of the sleeper 50, it is preferable that the width of the sleeper 50 is wide, and since the gravel bed must support the load until the cement mortar is filled, the weight of the sleeper 50 is reduced to reduce the vibration acceleration of the gravel bed. The larger the better, but for the mechanized construction using the existing railway maintenance equipment MTT (Multiple Tie Tamper) it is preferable to make the width of the sleepers 50 to 360mm. However, the width of the sleeper 50 may vary depending on the dimensions of the equipment used. In the case of using the concrete sleeper 50, it is also possible to apply the post-tension to the horizontal reinforcement to secure the required tensile strength.

Rail fastening device 60 is installed on the sleeper 50 is the sleeper 50 and the new icon 21 is integrated so that up and down ± 30mm using an insulating block or an eccentric bush to be adjusted in the event of a mistake in the track It is desirable to be able to adjust more than ± 25mm left and right.

Meanwhile, the asphalt surface layer 40 may be formed on the new icon layer 21 to facilitate drainage or to block surface contamination such as dust generation.

Looking at the construction method of the concrete phase track having the structure as described above, as shown in Figure 5 (a), first remove the existing sleeper 50 and the rail fastening device 60, the new sleeper 50 and the rail fastening device Install (60). In this case, using a machine such as a sleeper changer, it is generally possible to change 40 sleepers 50 per hour. After completing the work of replacing the sleeper 50 and the rail fastening device 60, the track 70 is coupled to the sleeper 50 using the replaced rail fastening device 60. When the track 70 is coupled, as shown in (b) of FIG. 5, the gravel is recovered by digging the existing phase in the front end using the phase cleaner. In the conventional phase excavation, the outer portion of the spherical conductive layer 20 is excavated with the inclined shoulder layer 22 formed so that the upper surface of the spherical conductive layer 20 becomes higher toward the outside in order to prevent the mixing of foreign matter. At this time, in the case of stopping the phase cleaner, the geotextile 30 is laid on the subgrade layer 10 exposed by the excavation of the spherical layer 20 by using the scroll of the geotextile 30 attached by the connecting beam. In addition, the rear end of the phase cleaner fills the new phase gravel washed in the field by using the dry phase gravel washing facility described above in the internal space formed by installing the geotextile 30. Generally, the phase cleaner can work 110m per hour, and the phase cleaner can remove the existing phase gravel, install the geotextile 30, take out the removed gravel, and fill the new phase gravel at the same time. . After the work performed by the phase cleaner, as shown in (c) of FIG. 5, the track gravel cleanup and linear adjustment is performed using the MTT. In case of linear adjustment work by MTT, it is possible to use high-tech equipment such as continuous work by computer and laser induction device, so that work efficiency is high and precision work is possible. In general, it can work 1200m section per hour. After the orbital gravel cleaning and linear adjustment work is completed, as shown in FIG. 5 (d), the pre-concrete concrete layer 21 is injected by injecting high-strength fast cement mortar into the new gravel layer using the continuous injection equipment 24. To form.

As described above, according to the concrete island track structure and construction method according to the present invention, after installing the geosynthetic fiber in advance and filling the new soil gravel and injecting cement mortar, it is possible to prevent the outflow of the compact concrete, There is no need to install a separate invert.

In addition, the existing phase gravel can be reused without having to carry it out, and the construction speed is significantly increased since the phase removal work, which was dependent on manpower, is performed using the phase cleaner.

In addition, although the speed of the train in operation was to be limited by installing a temporary support during the existing road improvement work, the present invention does not interfere with the operation of the train because a new icon layer is formed of high-strength fast-acting concrete. .

In addition, since the machine is used at all construction stages of the road improvement project, the construction time is significantly shortened, which is suitable for repairing or constructing railroad tracks within a limited time period. It can be applied to a high probability section.

In the above described the configuration and features of the present invention based on the embodiment according to the present invention, the present invention is not limited to this, it is possible to be freely modified according to the technical idea of the present invention.

Claims (5)

Geotextiles (30) laid on the upper surface of the subgrade (10), The new conductive layer 21 formed on the geosynthetic fiber 30, The new bed layer 21 is laid in parallel with each other, the concrete sleepers 50 reinforced in the transverse direction by applying post tension to secure the required tensile strength, The rail fastening device 60, which is laid on the sleeper 50 and is adjustable when the track is inaccurate, the upper and lower ± 30mm, the left and right ± 25mm or more, It consists of a track (70) vertically coupled to the sleeper (50) using the rail fastening device (60) on the top surface of the sleeper (50); The geosynthetic fiber 30 is laid so that the bottom surface of the geosynthetic fiber 30 is in contact with the upper surface of the subgrade layer 10, and panels are installed at left and right ends of the geosynthetic fiber 30 in a vertical direction with the bottom surface. Having a freestanding side surface; The new conductive layer 21 is a pre-concrete concrete track structure, characterized in that made of a high-strength fast-acting concrete hardened by filling the internal space in which the geotextile 30 is laid. delete The method of claim 1, The high-strength fast-acting concrete is to express a compressive strength of 30MPa or more, Cement mortar constituting the landscape is in fact a rigid cement concrete, Ca ^{2 +} and SO ₄ ^{2 -} comprises an additive component, and; The particle size of the aggregate constituting the pre-concrete concrete is 100% of the size passing weight of 63mm, 75-95% of the size passing weight of 50mm, 50-80% of the size passing weight of 40mm, 30mm Pre-concrete track structure, characterized in that the through-body weight of 25 to 50%, the through-body weight of 25 mm is 5 to 30%, the through-body weight of 20 mm is 0 to 10%. Replacing the existing sleepers 50 and the rail fastening device 60; Coupling the track (70) to the replaced sleeper (50) using the replaced rail fastening device (60); Excavation work of the spherical layer 20 is carried out at the front end of the iconic cleaner using the iconic cleaner, and at the same time, in the case of stopping the iconic cleaner, the installation of the geotextiles 30 having panels installed at both ends is performed. Dry washing the gravel to fill a new phase gravel layer in the internal space in which the geotextile 30 is installed; Adjusting the position of the trajectory (70) using MTT; And Method of constructing a pre-concrete concrete track, comprising the step of injecting a high-strength fast cement mortar into the new phase gravel layer to form a pre-concrete concrete layer (21). delete

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